Great Britain 1911 3d Hentschel essay (second proof), Essay.
Very fine set of three imperforate colour trials printed in brown-purple shades (Winston ink N0 66 & Manders Bros ink No 90) on yellow unwatermarked paper, endorsed 'Bright purple no48', 'Brown 3d' and 'purple stamp 21731' respectively.
A very scarce specialised piece of philately.
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